Newborns will have secretions inside their mouths, which is saliva. Newborns are not very good at swallowing saliva and will not swallow the secretions, so they will come up with a gurgling phenomenon that looks like spitting bubbles. If the bubbles are thicker, yellow in color, or if you have shortness of breath, are not particularly well, do not like to eat milk, or even have a little fever, you should pay attention to whether you have pneumonia, especially if you have a respiratory infection at home with your baby, you need to ask your pediatrician to take a look, listen to the lungs, count the number of breaths, and if necessary, do an examination to check for pneumonia.